Unity 3D Click & Drag Behavior.

DragBehavior.cs

using UnityEngine;
using System.Collections;

public class DragBehavior : MonoBehaviour 
{
	private Vector3 screenPoint;
	private Vector3 offset;

	void OnMouseDown ()
	{
		// Get the click location.
		screenPoint = Camera.main.WorldToScreenPoint(gameObject.transform.position);

		// Get the offset of the point inside the object.
		offset = gameObject.transform.position - Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, 
		                                                                                    Input.mousePosition.y, 
		                                                                                    screenPoint.z));
	}

	void OnMouseDrag ()
	{
		// Get the click location.
		Vector3 newScreenPoint = new Vector3(Input.mousePosition.x, 
		                                     Input.mousePosition.y, 
		                                     screenPoint.z);

		// Adjust the location by adding an offset.
		Vector3 newPosition = Camera.main.ScreenToWorldPoint(newScreenPoint) + offset;

		// Assign new position.
		transform.position = newPosition;
	}
}

Hey, is it cool if I use this in my project?